blocks|key|1942291|text|将您的中间类设置为相对位置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1942292|.middle+{
position:+relative;
}|code-block|syntax|javascript|1942293|这解决了你的问题，但不幸的是，我不能很好地解释为什么。也许其他人会。|1942294|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>Set your middle class to position relative.</p>

<pre><code>.middle {
position: relative;
}
</code></pre>

<p>This fixes your problem, but unfortunately I can't give a good explanation why. Maybe someone else will. </p>


blocks|key|1934454|text|正如我所理解的，你希望能够滚动到中间，并且总是在外部的底部有内部。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1934455|<div+class="outer">
++++<div+class="scrollableContainer">
++++++++<div+class="middle">
++++++++</div>
++++</div>
++++<div+class="inner">
++++++++inner+suppose+to+stay+at+the+bottom+of+the+outer.
++++</div>
</div>

<style>

.outer+{
++++position:+fixed;
++++top:+20px;
++++max-width:+400px;
++++width:+200px;
++++background:+red;
++++height:+400px;
}

.scrollableContainer+{
++++max-width:+400px;
++++width:+200px;
++++height:+400px;
++++overflow:+auto;
}

.middle+{
++++border:+dotted;
++++width:+100%25;
++++height:+800px;
++++padding:+100px+0;
++++position:+relative;
++++background:+green;
}

.inner+{
++++width:+100%25;
++++height:+100px;
++++position:+relative;
++++background:+yellow;
++++bottom:+0
}
</style>|code-block|syntax|javascript|1934456|或者，如果你想让内部总是在中间的底部，那么来自水果的解决方案是有效的，但我也没有解释。你可以把中间外面的内部放到中间下面的外部(什么？)|1934457|如下所示：|1934458|<div+class="outer">
++++<div+class="middle">
++++</div>
++++<div+class="inner">
++++++++inner+suppose+to+stay+at+the+bottom+of+the+outer.
++++</div>
</div>|1934459|让你成为你内心的亲人。|1934460|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<p>As i understood you want to be able to scroll over middle and always have inner at the bottom of outer.</p>

<pre><code>&lt;div class="outer"&gt;
    &lt;div class="scrollableContainer"&gt;
        &lt;div class="middle"&gt;
        &lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="inner"&gt;
        inner suppose to stay at the bottom of the outer.
    &lt;/div&gt;
&lt;/div&gt;

&lt;style&gt;

.outer {
    position: fixed;
    top: 20px;
    max-width: 400px;
    width: 200px;
    background: red;
    height: 400px;
}

.scrollableContainer {
    max-width: 400px;
    width: 200px;
    height: 400px;
    overflow: auto;
}

.middle {
    border: dotted;
    width: 100%;
    height: 800px;
    padding: 100px 0;
    position: relative;
    background: green;
}

.inner {
    width: 100%;
    height: 100px;
    position: relative;
    background: yellow;
    bottom: 0
}
&lt;/style&gt;
</code></pre>

<p>Or if you wanted to have the inner always on the bottom of the middle then the solution from Frutis works but i have also no explanation. And you could put the inner outside the middle into the outer under the middle (what?)</p>

<p>like this:</p>

<pre><code>&lt;div class="outer"&gt;
    &lt;div class="middle"&gt;
    &lt;/div&gt;
    &lt;div class="inner"&gt;
        inner suppose to stay at the bottom of the outer.
    &lt;/div&gt;
&lt;/div&gt;
</code></pre>

<p>and make your inner relative.</p>


blocks|key|1934462|text|我已经做到了这一点，问题是内部的宽度，不能使用100%25，因为重叠滚动条。我的设置是184px，在我的电脑上使用Chrome和Firefox运行得很好，但可能在其他浏览器或其他浏览器上并不是最好的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1934463|​|1934464|.dummy+{
++position:+relative;
++width:+200px;
}

.outer+{
++max-width:+400px;
++background:+red;
++height:+300px;
++overflow:+auto;
++width:+200px;
}

.middle+{
++width:+100%25;
++height:+800px;
++padding:+100px+0;
++background:+green;
}

.inner+{
++width:+184px;
++position:+absolute;
++height:+100px;
++background:+yellow;
++bottom:+0;
}|code-block|syntax|javascript|1934465|<div+class="dummy">
++<div+class="outer">
++++<div+class="middle">
++++++<div+class="inner">
++++++++inner+suppose+to+stay+at+the+bottom+of+the+outer.
++++++</div>
++++</div>
++</div>
</div>|1934466|1934467|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|K|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

<p>I have achieved this, the problem is the width of inner, can't use 100% because overlap the scrollbar. I set in 184px and works fine in my PC with Chrome and Firefox but maybe in others browser or SO is not the best value:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.dummy {
  position: relative;
  width: 200px;
}

.outer {
  max-width: 400px;
  background: red;
  height: 300px;
  overflow: auto;
  width: 200px;
}

.middle {
  width: 100%;
  height: 800px;
  padding: 100px 0;
  background: green;
}

.inner {
  width: 184px;
  position: absolute;
  height: 100px;
  background: yellow;
  bottom: 0;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="dummy"&gt;
  &lt;div class="outer"&gt;
    &lt;div class="middle"&gt;
      &lt;div class="inner"&gt;
        inner suppose to stay at the bottom of the outer.
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;</code></pre>
</div>
</div>
</p>


<p>I have 3 elment in my page. They are outer, middle and inner.</p>

<p>html code:</p>

<pre><code>&lt;div class="outer"&gt;
  &lt;div class="middle"&gt;

      &lt;div class="inner"&gt;
        inner suppose to stay at the bottom of the outer.
       &lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
</code></pre>

<p>css code:</p>

<pre><code>.outer {
  position: fixed;
  top: 20px;
  max-width: 400px;
  background: red;
  height: 400px;
  overflow: auto;
  width: 200px;
}
.middle {
  width: 100%;
  height: 800px;
  padding: 100px 0;
  position: static;
  background: green;
}
.inner {
  width: 100%;
  position: absolute;
  height:100px;
  background: yellow;
  bottom: 0
}
</code></pre>

<p>I think inner should stay at the bottom of outer. However, I doesn't. Can anybody tell me why?</p>


css fixed and absolute problems

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我的页面中有3个元素。它们分别是外部、中间和内部。html代码：<div class="outer">  <div class="middle">      <div class="inner">        inner suppose to stay at the bottom of the outer.     ...

问css固定和绝对问题
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